US1502039A

US1502039A - Tire alarm

Info

Publication number: US1502039A
Application number: US640614A
Authority: US
Inventors: Knutson William
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-05-21
Filing date: 1923-05-21
Publication date: 1924-07-22
Anticipated expiration: 1941-07-22

Description

Patented Jetty 22, i924-,

UNITED WILLIAM KNUTSON, OF FORT SIIAW, MONTANA. 4, I;

i TIRE ALARM.

Application filed May 21,

T all whom it may concern.'

Be it known that I, WILLIAM KNUTsoN, a

, citizen of the United States, residing at falls below a predetermined point and thereby effectively warning the driver of the vehicle that his tire needs attention.

.'Another prime object ofthe invention is the provision of an audible signal for giving warning to the driverl ofr the vehicle when pressure inthe tires falls below a predetermined point, whereby ,the necessary vattention can be given thereto, thereby effectively saving the tires from rim cuts, stone bruises and the like.

f A/further prime object of the invention is the provision of a novelattachment for association with the ordinary air valve of'a pneumatic tire embodying means ffor per mitting the escape of the air from the tire when the pressure in the tire'falls -below a predetermined point and to provide a whistle disposed in the path of the escaping air, whereby a signal will be given. j

A still further; objectof theinvention is to provide a tire alarm of the above character, which will be durable and eiiicient in use, one that will be simple and easy to manufacture and one which can be readily associated with a vehicle wheel and tire at a minimum cost.

With these and other objects in view, the invention consists in the novel construction, arrangement and formation of parts, as will be hereinafter more specifically described, claimed and illustrated in the accompanying drawings, in which drawings:

Figure 1 is a side elevation of the improved tire alarm, and

Figure 2 is a longitudinal section through the same.

Referring to the drawings in detail, wherein similar reference characters designate" corresponding parts throughout the several views, the letter A generally indii923.4 serial No'. 640,614.

cates the improved tire alarm and ordinary tire lling valve.,V Asf shown` the tire filling air valve B comprises the ordi-,:

nary casing 5, through whichggprojects the,` ordinaryrvalve stem 6. As isv common, the valve stein 6 can be depressed.forunseating` the valve of the tire filling valve Bfor per-r mitting the, escape of air from the tire. i .j

The kimproved attachment A, comprises a cylindrical body 1O1-which` is preferably,

threaded `internally throughout its length as,

at 11` The extreme inner end of the bodyi" 10 is provided with a restrictedneck `por-:Y

tion 12, which is adapted .to bethreaded ong;

the outer end, of the ordinary tire filling valve B.k As shown the oute'r surface of the,

j 1,502,039*l PATENTv OFFICE.

restricted neckportion12 is provided with external threads 13 forl the reception lof a. protecting cap 14 which is adaptedt'o-house@ all ofthe parts of the attachment. Thisprofr tecting dust cap 14 will be hereinafterrmorel. fully described. Inorder to form a fluid,- tight joint between the neck 12 j and the, body 5 of the ordinary air filling tire valveg B I provide a rubber gasket 15 which is dis-. posed between the inner end of lthe neck and a shoulder formed on the saidbody 5, i,

A circular plate 16 is disposed within the body V10 and rests upon a' shoulder 17l formed by the restricted neck-12Jand`this,v

plate 16 is adapted to engage the outer end; I

throughfjthefplate 16 Suitable air, escape'.

openings 18 are formed inthe same. Aty a point intermediate the ends of the body 10 I provide a valve seat 19 which is externally threaded to permit the ready positioning thereof in the said body. Adapted to t upon the valve seat 19 I provide a frustoconical shaped valve head 2O which is provided with a disk-shaped plate 21 having air escape openings 22 therein. This valve 2O is normally held upon its seat by the air pressure from the tire and in order to insure the normal seating thereof I provide an eX- pansion coil spring 23 which engages the base plate 21 ofthe valve 20 and the supporti/ng plate 16. In order to prevent turning of the valve and the base plate 21 I pro-` vide raised tits 211 which are adapted to fit. in depressions 25 formed on the inner surface'of the valve seat 19.

Disposed adjacent the outer end of the off the valve 20. This plate 28 is provided with air escape openings 30. A relatively heavy expansion spring 3l is disposed between the plate 26V4 and the plate 28 and is adapted to unseat the valve 20 against the f 'tension 'of the spring 23 when the pressure in they vtire falls 'below al predetermined point. The ext-renie outer end or the body l0 carries a supporting plate 3l which adjustably carries a threaded stem 32. This stem 32 can be threaded into and out of the body L10 and serves as means for `indicating the-position of the plate 2G. As stated, by adjusting the plate 26, the tension of the spring can be adjust-ed and by turning the vstem -32 into engagement with the plate the pressure at which the valve will be unseated can be determined. .This is accomplished through the medium of a graduated scale 33 on the said stem. The stem 32 can be held in an adjusted position by means of a holding nut 34 if rso desired.

The whistle'is lcarried `by the. outer end of the body :and the stem 32 for-ms a part there-- of and supports the dome 35 of the said whistle. As' shown the dome is provided with a cross strap V36 which engages the stem. It yis obvious that when the pressure in the valve falls below a predetermined point that the spring 31 being stronger than the spring 23 will overcome the tension thereofandjthe existing pressure acting on the valve and thus vbring about the `efl'ectively give an alarm.

As clearly shown in Figure 1, the protecting cover 14 is provided with screen covered openings l/l, which permit the escape of the air from the. Cover.

From the foregoing description it can be seen ythat I have provided an exceptionallyv simple and compact attachment for vehicle tires which will elfectively give an ala-rm7 when the pressure in the tires falls below a predetermined point.

Changes in details may be made providing the same do not depart from the spirit or scope of the invention, as set forth in the annexed claim.

What I claim as new is:

The combination with an ordinary tire air filling valve including a body and a valve stem, of an attachment therefor includingl a body arranged to receive the outer end of the air valve filling body, a valve seat adjustably oarried by the body of the attachment, a normally closed valve carried by the body ol the attachment for litting upon the seat, an adjustable plate threaded into the body of the attachment opposite of said valve seat, a spring engaging said adjustable plate for unseating the valve when the pressure in the air lilling tire valve falls below a predetermined value, means for indicating the`position of said adjustable platej and la whistle carried by said means adapted to'be sounded by the escape of air through said valve body.

In testimony whereof I alliX my signature in presence of two witnesses.

WILLIAM KNUTSON,

Witnesses J. THoRUD, FRANK J. HIRSHBERG.